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Old 12-22-2010, 07:00 AM
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6 Cylinder with V8 Driveline

Hello there! I have a '66 Mustang with a 200ci straight 6 cylinder engine. When I bought the car it already had a V8 three speed manual. Are the gear ratios different than a normal 6 cyl. Manual?

I also want to put in an 8" rearend for two reasons. One is mainly for more wheel choices with the five-lug pattern and the other reason is the stock smaller reared looks like its ready to give out at any given moment!

How different are the stock 289 manual trans and 8"rear gears compared to the stock 6 cylinder driveline and how will this affect the streetability of my economical 6? I do plan on this engine having a few upgrades in it like a 2 barrel carbn and a hot cam..
Also bigger valves and roller rockers.. I'm hoping for close to 200 HP? How will this V8 driveline
uwork out?

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Old 12-22-2010, 11:17 AM
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that's not a V8 driveline. sounds like a 6cyl driveline that someone put a V8 in... many mustangs are converted to V8, but few are done correctly. if it's still got the 7 1/4" 4 lug rear, then it also probably still has the 6cyl spindles, making it almost 100% 6cyl

converting to an 8" if you plan to make any power is pretty much nessasary. a Ford Maverick will have what you need, but you could find somthing else also. V8 mustang or Falcon will also have an 8" that fits.. as for trans gear ratio. I'm pretty sure there was no 6cyl or 8 trans. owner could have gotten a V8 bell and hooked it up to the stock 3spd that was behind the original 6.. you can decode the data tag on the door for the axle ratio. but it's probably 3.00, 3.23 or somthing like that. 6cyls were sporty econo box's, and were geared high like that... as for HP. 200 isn't a streach but you cant do it with a stock head, at least N/A.. you will need the aussie or the classic inlines aftermarket head w/ removable intake to gain enough flow to support that HP.. beyond that, you need to maintain the compression ratio.. Tempo/taurus 2.3 pistions will bring the deck to zero, and there flat tops. that will net you about 9:1 compression if you get the thinnest gasket available which is a .045 compressed fel-pro... the only roller rockers I would run are the Yella Terra full rollers
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Old 12-22-2010, 11:33 AM
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it still has the 6cyl in it, if i read that right.

how does it drive now, do the gear ratios seem ok?
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Old 12-22-2010, 02:07 PM
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it sounds like, he pulled the V8 and is putting a 6 back in it
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Old 12-22-2010, 11:53 PM
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Let me explain better.. its a 6 cylinder car with that 6 cyl still in it.. the size of the input shaft confirms it is a V8 transmission like the previous owner said had been swapped in.. I want to swap in an 8".. will the stock 8" work well with less than 200 HP?
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Old 12-23-2010, 02:59 AM
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6cyl?out of date?
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Old 12-23-2010, 08:56 AM
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how does it drive now, do the gear ratios seem ok?
also need to know what gear ratio the rearend in it has now.
the car wont care where the new rearend came from.
its just a matter of getting the correct ratio for what you want.
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Old 12-23-2010, 10:20 AM
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yep. you will find the Maverick 8" that will work great in the Mustang behind many 6cyl Mavericks.. a V8 or stick car will have a bit lower ratio which would help acceleration
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Old 01-01-2011, 09:46 PM
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Check the top cover on the trans. If it has only four bolts holding it down, the trans is incredibly weak. My '66 Mustang had the 200 with that trans and the small 3.20 rear. It went through 13 transmissions and one rear end in under 30,000 miles. My previous ('54 Chevy) and subsequent ('69 Nova) cars had no such problems. I'd convert the whole shebang to V-8 parts, which also should have no such problems.
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